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meson (n.)
subatomic particle, 1939, from Greek mesos "middle" (from PIE root *medhyo- "middle") + subatomic particle suffix -on. Earlier mesotron (1938). So called for being intermediate in mass between protons and electrons. An earlier use of the word, from the Greek noun meson "center," meant "the medial plane which divides the body into two equal and symmetrical parts" (by 1883).
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Definitions of meson
Dictionary entries near meson
Mesoamerica
mesocracy
mesoderm
mesolithic
mesomorph
meson
Mesopotamia
mesosphere
mesothelioma
Mesozoic
mesquite